Why the texture does not show on my object?
The .obj file is improperly set

Should be

f 1/1/1 2/2/2 3/3/3
f 2/2/2 3/3/3 4/4/4
f 3/3/3 4/4/4 5/5/5
f 4/4/4 5/5/5 6/6/6


instead of 

f 1 2 3
f 2 3 4
f 3 4 5
f 4 5 6


and vt values should be between 0 and 1